Arylsulphonamide-substituted benzimidazoles having tryptase-inhibiting activity

ABSTRACT

Bezimidazole derivatives of general formula (I)having tryptase-inhibitory activity. Exemplary are:N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-ethoxycarbonyl-benzenesulphonamide)-hydrochloride,N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)-dihydrochloride, andN-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-bromo-benzenesulphonamide)-hydrochloride.

RELATED APPLICATIONS

The benefit of prior provisional application Serial No. 60/157,389, filed on Oct. 1, 1999 is hereby claimed.

FIELD OF THE INVENTION

The invention relates to substituted arylsulphonamide-substituted benzimidazoles having tryptase-inhibiting activity, methods for preparing such compounds and their use for the treatment of inflammatory and/or allergic diseases.

BACKGROUND OF THE INVENTION

Benzimidazole derivatives are known from the prior art as active substances having valuable pharmaceutical properties. Thus, International Patent Application WO 98/37075 discloses, in addition to other bicyclic heterocycles, benzimidazoles which can be used to good effect for the prevention and treatment of venous and arterial thrombotic diseases, on the basis of their thrombin-inhibiting activity.

SUMMARY OF THE INVENTION

In contrast to the use of benzimidazole derivatives as described above and known from the prior art, the aim of the present invention is to prepare new tryptase-inhibitors which can be used, on the basis of their tryptase-inhibiting properties, for the prevention and treatment of inflammatory and/or allergic diseases.

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides new benzimidazoles of general formula (I)

wherein:

R¹ denotes a group selected from among C₁-C₆-alkyl, C₂-C₆-alkenyl and C₂-C₆-alkinyl, which may optionally be mono-, di- or trisubstituted by one or more of the groups hydroxy, C₁-C₄-alkoxy, CF₃, phenoxy, COOH, halogen, —CO(C₁-C₄-alkoxy), —CONH₂, —CO—NH(C₁-C₄-alkyl), —CO—N(C₁-C₄-alkyl)₂, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂ or C₁-C₄-alkoxy-phenoxy, or

a C₃-C₈-cycloalkyl optionally linked via a C₁-C₄-alkylene bridge, which may optionally be mono-, di- or trisubstituted by one or more of the groups hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄-alkoxycarbonyl or CF₃, or

phenyl-C₁-C₄-alkyl, which may optionally be mono-, di- or trisubstituted by one or more of the groups hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄-alkoxycarbonyl or CF₃, or

a 5- or 6-membered, saturated or unsaturated heterocyclic group linked directly or via a C₁-C₄-alkylene bridge, which may contain one or two hetero atoms selected from among oxygen, nitrogen or sulphur and which may optionally be substituted by C₁-C₄-alkyl or benzyl;

R² denotes —C(═NH)NH₂ or —CH₂—NH₂;

R³ denotes a group selected from among phenyl, benzyl, naphthyl, furan, quinolyl, isoquinolyl, benzofuranyl, thienyl and benzothienyl, which is mono-, di- or trisubstituted in each case by one or more of the groups selected from among C₁-C₄-alkyl, C₁-C₄-alkoxy, halogen, C₁-C₄-alkyl-halogen, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, NO₂, hydroxy, —CF₃, —NHCO—C₁-C₄-alkyl, —COOH, —COO(C₁-C₄-alkyl), —CONH₂, —CONH(C₁-C₄-alkyl), —CON(C₁-C₄-alkyl)₂, —CONH(C₁-C₄-alkyl)—COO(C₁-C₄-alkyl) and phenyl-C₁-C₆-alkyl, wherein the substituent phenyl-C₁-C₆-alkyl may in turn be substituted by a group selected from among C₁-C₆-alkoxy, hydroxy, halogen, CF₃ and C₁-C₆-alkyl;

R⁴ denotes hydrogen, a C₁-C₆-alkyl group, which may be mono- or disubstituted by one or two of the groups —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂, or

a 5-, 6- or 7-membered, saturated or unsaturated heterocyclic group linked directly or via a C₁-C₄-alkylene bridge or via a C₁-C₄-alkylene-CO bridge which may optionally contain one, two or three hetero atoms selected from among oxygen, nitrogen or sulphur and which may optionally be substituted by C₁-C₄-alkyl, benzyl or pyridyl;

C₃-C₈-cycloalkyl, which may be mono- or disubstituted by one or two of the groups —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂, or

phenyl, benzyl or phenylethyl, which may be mono- or disubstituted at the phenyl ring by one or two of the groups —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C₁-C₄-alkyl-NH₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂, ps optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

The compounds of formula I of the invention have a tryptase-inhibiting effect and may be used according to the invention for the prevention and treatment of diseases in which tryptase-inhibitors may develop a therapeutic effect.

Preferred are those compounds of formula I wherein:

R¹ denotes C₁-C₆-alkyl, which may optionally be mono-, di- or trisubstituted by one or more of the groups hydroxy, C₁-C₄-alkoxy, CF₃, phenoxy, COOH, halogen, —CO(C₁-C₄-alkoxy), —CONH₂, —CO—NH(C₁-C₄-alkyl), —CO—N(C₁-C₄-alkyl)₂, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂ or C₁-C₄-alkoxy-phenoxy, or

a C₃-C₈-cycloalkyl optionally linked via a C₁-C₄-alkylene bridge, which may optionally be mono-, di- or trisubstituted by one or more of the groups hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄-alkoxycarbonyl or CF₃, or

phenyl-C₁-C₄-alkyl, which may optionally be mono-, di- or trisubstituted by one or more of the groups hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄-alkoxycarbonyl or CF₃, or

a 5- or 6-membered, saturated or unsaturated heterocyclic group linked directly or via a C₁-C₄-alkylene bridge, which may contain one or two hetero atoms selected from among oxygen, nitrogen or sulphur and which may optionally be substituted by C₁-C₄-alkyl or benzyl;

R² denotes —C(═NH)NH₂ or —CH₂—NH₂;

R³ denotes a group selected from among phenyl, benzyl, naphthyl, quinolyl, isoquinolyl, thienyl and benzothienyl which is mono-, di- or trisubstituted in each case by one or more of the groups selected from among C₁-C₄-alkyl, C₁-C₄-alkoxy, halogen, —C₁-C₄-alkyl-halogen, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, NO₂, hydroxy, —CF₃, —NHCO—C₁-C₄-alkyl, —COOH, —COO(C₁-C₄-alkyl), —CONH₂, —CONH(C₁-C₄-alkyl), —CON(C₁-C₄-alkyl)₂, —CONH(C₁-C₄-alkyl)-COO(C₁-C₄-alkyl) and phenyl-C₁-C₄-alkyl, wherein the substituent phenyl-C₁-C₄-alkyl may in turn be substituted by a group selected from among C₁-C₄-alkoxy, hydroxy, halogen, CF₃ and C₁-C₄-alkyl;

R⁴ denotes hydrogen, a C₁-C₆-alkyl group, which may be mono- or disubstituted by one or two of the groups —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂, or

a 5-, 6- or 7-membered, saturated or unsaturated heterocyclic group linked directly or via a C₁-C₄-alkylene bridge or via a C₁-C₄-alkylene-CO bridge, which may optionally contain one, two or three hetero atoms selected from among oxygen, nitrogen or sulphur and may optionally be substituted by C₁-C₄-alkyl, benzyl or pyridyl;

C₃-C₈-cycloalkyl, which may be mono- or disubstituted by one or two of the groups —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂, or

phenyl, benzyl or phenylethyl, which may be mono- or disubstituted at the phenyl ring by one or two of the groups —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, C₁-C₄-alkyl-NH₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂,

optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

More preferred are those compounds of formula I wherein:

R¹ denotes C₁-C₅-alkyl, which may optionally be mono-, di- or trisubstituted by one or more of the groups hydroxy, C₁-C₄-alkoxy, CF₃, phenoxy, COOH, —CO(C₁-C₄-alkoxy), —CONH₂, —CO—NH(C₁-C₄-alkyl), —CO—N(C₁-C₄-alkyl)₂ or C₁-C₄-alkoxy-phenoxy, or

a C₃-C₈-cycloalkyl optionally linked via a C₁-C₄-alkylene bridge, which may optionally be mono-, di- or trisubstituted by one or more of the groups hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄-alkoxycarbonyl or CF₃, or

phenyl-C₁-C₄-alkyl, which may optionally be mono-, di- or trisubstituted by one or more of the groups hydroxy, C₁-C₄-alkoxy, carboxy, C₁-C₄-alkoxycarbonyl or CF₃, or

a 5- or 6-membered, saturated or unsaturated heterocyclic group linked directly or via a C₁-C₄-alkylene bridge, which may contain one or two hetero atoms selected from among oxygen, nitrogen or sulphur and may optionally be substituted by C₁-C₄-alkyl or benzyl;

R² denotes —C(═NH)NH₂ or —CH₂—NH₂;

R³ denotes a group selected from among phenyl, benzyl, benzothienyl, quinolyl, isoquinolyl and naphthyl, which is mono-, di- or trisubstituted in each case by one or more of the groups selected from among C₁-C₄-alkyl, C₁-C₄-alkoxy, halogen, CF₃, —C₁-C₄-alkyl-halogen, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, NO₂, hydroxy, —CF₃, —NHCO—C₁-C₄-alkyl, —COOH, —COO(C₁-C₄-alkyl), —CONH₂, —CONH(C₁-C₄-alkyl), —CON(C₁-C₄-alkyl)₂, —C(CH₃)₂-phenyl (wherein the phenyl group may be substituted by one or more halogen atoms or hydroxy groups) and —CONH(C₁-C₄-alkyl)-COO(C₁-C₄-alkyl);

R⁴ denotes a C₁-C₆-alkyl group, which may be mono- or disubstituted by one or two of the groups —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂, or

a 5-, 6- or 7-membered, saturated or unsaturated nitrogen heterocyclic group linked directly or via a C₁-C₄-alkylene bridge or via a C₁-C₄-alkylene-CO bridge, which may optionally contain one or two other hetero atoms selected from among oxygen, nitrogen or sulphur and may optionally be substituted by C₁-C₄-alkyl, benzyl or pyridyl;

cyclopropyl, cyclopentyl or cyclohexyl, each of which is mono- or disubstituted by one or two of the groups —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂, or

unsubstituted benzyl or phenyl, benzyl or phenylethyl which are mono- or disubstituted at the phenyl ring by one or two of the groups —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂,

optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

Even more preferred substituted benzimidazole derivatives of general formula (I) are those wherein:

R¹ denotes methyl, ethyl, propyl, butyl or pentyl, each of which may be substituted by one of the groups hydroxy, methoxy, ethoxy, propoxy, CF₃, phenoxy, COOH, CONH₂, CONHMe or methoxy-phenoxy, or

benzyl, phenylethyl or phenylpropyl, which may be mono- or disubstituted at the phenyl ring by one or two of the groups hydroxy, methoxy, ethoxy, carboxy, methoxycarbonyl, ethoxycarbonyl or CF₃, or

a 5- or 6-membered, saturated or unsaturated heterocyclic group linked directly or via a C₁-C₄-alkylene bridge, which may contain one or two hetero atoms selected from among oxygen or nitrogen and may optionally be substituted by methyl, ethyl, propyl or benzyl;

R² denotes —C(═NH)NH₂ or —CH₂—NH₂;

R³ denotes phenyl, benzyl or naphthyl, each of which is mono- or disubstituted by one or two groups selected from among methyl, ethyl, propyl, butyl, methoxy, ethoxy, propoxy, butoxy, fluorine, chlorine, bromine, iodine, —CF₃, —NH₂, —NHmethyl, —NHethyl, —Nmethyl₂, —Nethyl₂, NO₂, —NHCO-methyl, —NHCO-ethyl, —COOH, —COOmethyl, —COOethyl, —CONH₂, —CONHmethyl, —CONHethyl, —CONmethyl₂, —CONethyl₂, —CONH—CH₂—COOH, —CONH—CH2—COOmethyl, —CONH—CH₂—COOethyl, —CONH—CH₂CH₂—COOH, —CONH—CH₂CH₂—COOmethyl, —C(CH3)₂-phenyl (wherein the phenyl group may be substituted by one or more halogen atoms or hydroxy groups) and —CONH—CH₂CH₂—COOethyl;

R⁴ denotes a group selected from among ethyl, propyl, butyl, pentyl and hexyl, each of which is mono- or disubstituted by one or two of the groups —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propy1)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂, or

a 5-, 6- or 7-membered, saturated or unsaturated nitrogen-heterocyclic group linked directly or via a C₁-C₄-alkylene bridge, which may optionally contain one or two other hetero atoms selected from among oxygen or nitrogen and may optionally be substituted by methyl, ethyl, propyl or benzyl, or

cyclopentyl or cyclohexyl, each of which may be mono- or disubstituted by one or two of the groups —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂, or

unsubstituted benzyl or benzyl or phenylethyl which are mono- or disubstituted at the phenyl ring by one or two of the groups —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂,

optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

Still more preferred are substituted benzimidazole derivatives of general formula (I), wherein:

R¹ denotes methyl, ethyl, propyl, butyl or pentyl, preferably methyl;

R² denotes —C(═NH)NH₂ or —CH₂—NH₂, preferably —C(═NH)NH₂;

R³ denotes phenyl or naphthyl, each of which is substituted by one or two groups selected from among methyl, ethyl, tert.-butyl, methoxy, ethoxy, fluorine, chlorine, bromine, CF₃, —NH₂, —NHmethyl, —NHethyl, —Nmethyl₂, —Nethyl₂, NO₂, —NHCO-methyl, —NHCO-ethyl, —COOH, —COOmethyl, —COOethyl, —CONH₂, —CONHmethyl, —CONHethyl, —CONmethyl₂, —CONethyl₂, —CONH—CH₂—COOH, —CONH—CH₂—COOmethyl, —C(CH₃)2-phenyl (wherein the phenyl group may be substituted by one or more halogen atoms or hydroxy groups) and —CONH—CH₂—COOethyl;

R⁴ denotes ethyl or propyl, each of which is substituted by one of the groups —NH₂, —N(methyl)₂, —N(ethyl)₂, —N(n-propyl)₂ or —C(═NH)NH₂, or

a 5-, 6- or 7-membered, saturated or unsaturated nitrogen-heterocyclic group linked directly or via a methylene or ethylene bridge, which may contain an oxygen as a further heteroatom and may optionally be substituted by methyl, ethyl, propyl or benzyl, or

cyclopentyl or cyclohexyl, each of which is substituted by one of the groups —NH₂, —N(methyl)₂, —N(ethyl)₂, —N(n-propyl)2 or —C(═NH)NH₂, or

benzyl, which may be substituted at the phenyl ring by one of the groups —NH₂, —N(methyl)₂, —N(ethyl)₂, —N(n-propyl)2 or —C(═NH)NH₂,

optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

Even more greatly preferred are substituted benzimidazole derivatives of general formula (I), wherein:

R¹ denotes methyl, ethyl, propyl, butyl or pentyl, preferably methyl;

R² denotes —C(═NH)NH₂ or —CH₂—NH₂, preferably —C(═NH)NH₂;

R³ denotes phenyl which is substituted by one or two groups selected from among methyl, ethyl, tert-butyl, methoxy, ethoxy, fluorine, chlorine, bromine, CF₃, and/or a group selected from among —NH₂, —NHmethyl, —NHethyl, —Nmethyl₂, —Nethyl₂, NO₂, —NHCO-methyl, —NHCO-ethyl, —COOH, —COOmethyl, —COOethyl, —CONH₂, —CONHmethyl, —CONHethyl, —CONmethyl₂, —CONethyl₂, —CONH—CH₂—COOH, —CONH—CH₂—COOmethyl, —C(CH₃)₂-phenyl, (wherein the phenyl group may be substituted by one or more halogen atoms or hydroxy groups) and —CONH—CH₂—COOethyl, or naphthyl which is substituted by —Nmethyl₂ or chlorine;

R⁴ denotes benzyl, pyridylmethyl, dimethylaminoethyl, diethylaminoethyl, dimethylaminopropyl or diethylaminopropyl,

optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

Still more greatly preferred are substituted benzimidazole derivatives of general formula (I), wherein:

R¹ denotes methyl, ethyl or propyl, preferably methyl;

R² denotes —C(═NH)NH₂ or —CH₂—NH₂, preferably —C(═NH)NH₂;

R³ denotes phenyl substituted by one or two groups selected from among methyl, ethyl, tert-butyl, methoxy, ethoxy, fluorine, chlorine, bromine, CF₃, and/or a group selected from among —NH₂, —NHmethyl, —NHethyl, —Nmethyl₂, —Nethyl₂, NO₂, —NHCO-methyl, —NHCO-ethyl, —COOH, —COOmethyl, —COOethyl, —CONH₂, —CONHmethyl, —CONHethyl, —CONmethyl₂, —CONethyl₂, —CONH—CH₂—COOH, —CONH—CH₂—COOmethyl, —C(CH₃)₂-phenyl, (wherein the phenyl group may be substituted by one or more halogen atoms or hydroxy groups), and —CONH—CH₂—COOethyl, or naphthyl which is substituted by —Nmethyl₂ or chlorine;

R⁴ denotes dimethylaminoethyl or diethylaminoethyl, optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

Penultimately preferred are substituted benzimidazole derivatives of general formula (I), wherein:

R¹ denotes methyl;

R² denotes —C(═NH)NH₂ or —CH₂—NH₂, preferably —C(═NH)NH₂;

R³ denotes phenyl substituted by one or two groups selected from among methyl, tert-butyl, methoxy, chlorine, bromine, CF₃, and/or a group selected from among —NH₂, NO₂, —NHCO-methyl, —COOethyl, —CONH—CH₂—COOH, —C(CH₃)2-phenyl (wherein the phenyl group may be substituted by one or more halogen atoms or hydroxy groups), and —CONH—CH₂—COOethyl, or naphthyl which is substituted by —Nmethyl₂ or chlorine;

R⁴ denotes benzyl or diethylaminoethyl,

optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

Ultimately preferred and exemplary of the invention are the following specific compounds:

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-ethoxycarbonyl-benzenesulphonamide)-hydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)-dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-bromo-benzenesulphonamide)-hydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-nitro-benzenesulphonamide)-hydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-methoxy-benzenesulphonamide)-hydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-methyl-benzenesulphonamide)-hydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-chloro-benzenesulphonamide)-hydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-amino-benzenesulphonamide)-tetrahydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-acetylamino-benzenesulphonamide)

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-chloro-benzenesulphonamide)

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-[3,5-di-(trifluoromethyl)-benzenesulphonamide] dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(6-hydroxy-naphth-2-ylsulphonamide) dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-trifluormethyl-benzenesulphonamide)dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-[3-(1-methyl-1-phenyl-ethyl)-benzenesulphonamide]dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-aminoethyl-(dansylamide)dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-tert-butyl-benzenesulphonamide)dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-pyrid-3-ylmethyl-(dansylamide)dihydrochioride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(8-chloro-naphth-1-ylsulphonamide)dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-pyrid-4-ylmethyl-(dansylamide)dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-benzyl-(4-tert-butyl-benzenesulphonamide)dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-nitro-benzenesulphonamide)dihydrochloride

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-amino-benzenesulphonamide)dihydrochloride.

In addition to the abovementioned compounds of general formula (I) the present invention also relates to compounds which are only converted into the therapeutically effective compounds of general formula (I) by the body after being taken by the patient, on the basis of a functionality which can be cleaved in vivo. Such compounds are known as prodrugs. According to another aspect the invention therefore relates to prodrugs of general formula (II)

wherein

R¹ and R³ may be as hereinbefore defined and

R⁴ may be as hereinbefore defined or may denote C₁-C₄-alkyl which is substituted by a group selected from among —C(═NOH)NH₂, —C(═NCOO—C₁-C₁₂-alkyl)NH₂ or —C(═NCOO—C₁-C₈-alkyl-phenyl)NH₂;

R⁵ denotes hydroxy, —COO—C₁-C₁₂-alkyl, —CO-phenyl, —CO-pyridyl or —COO—C₁-C₈-alkyl-phenyl, whilst in the abovementioned group the phenyl ring may be substituted in each case by C₁-C₄-alkyl, C₁-C₄-alkoxy, OH, halogen or CF₃,

optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

Preferred are prodrugs of general formula (II) wherein

R¹ and R³ may be as hereinbefore defined and

R⁴ may be as hereinbefore defined or denotes C₁-C₄-alkyl which is substituted by a group selected from among —C(═NOH)NH₂, —C(═NCOO—C₁-C₆-alkyl)NH₂ or —C(═NCOO—C₁-C₆-alkyl-phenyl)NH₂;

R⁵ denotes hydroxy, —COO—C₁-C₆-alkyl, —CO-phenyl, —CO-pyridyl or —COO—C₁-C₆-alkyl-phenyl, whilst in the abovementioned group the phenyl ring may be substituted in each case by C₁-C₄-alkyl, C₁-C₄-alkoxy, OH, halogen or CF₃,

optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

Particularly preferred are prodrugs of general formula (II), wherein

R¹, R³ and R⁴ may be as hereinbefore defined and

R⁵ may denote hydroxy, methoxycarbonyl, ethoxycarbonyl, propyloxycarbonyl, butyloxycarbonyl, benzoyl, benzyloxycarbonyl or nicotinoyl,

optionally in the form of their tautomers, racemates, enantiomers, diastereomers and mixtures thereof, and optionally the pharmacologically acceptable acid addition salts thereof.

The term alkyl groups (including those which are part of other groups), unless otherwise stated, denotes branched and unbranched alkyl groups with 1 to 12 carbon atoms, preferably 1-8 carbon atoms, most preferably 1 to 6 carbon atoms. Examples are: methyl, ethyl, propyl, butyl, pentyl, hexyl, etc. Unless otherwise stated, the above terms propyl, butyl, pentyl or hexyl also include all the possible isomeric forms. For example, the term propyl also includes the two isomeric groups n-propyl and iso-propyl, the term butyl includes n-butyl, iso-butyl, sec. butyl and tert.-butyl, the term pentyl includes iso-pentyl, neopentyl, etc. In some cases common abbreviations are also used to denote the abovementioned alkyl groups, such as Me for methyl, Et for ethyl etc.

The term alkenyl groups (including those which are part of other groups) denotes branched and unbranched alkenyl groups having 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms, provided that they have at least one double bond, for example the alkyl groups mentioned above as well, provided that they have at least one double bond, such as for example vinyl (provided that no unstable enamines or enolethers are formed), propenyl, iso-propenyl, butenyl, pentenyl and hexenyl.

The term alkinyl groups (including those which are part of other groups) denotes alkinyl groups having 2 to 6 carbon atoms, provided that they have at least one triple bond, e.g. ethinyl, propargyl, butinyl, pentinyl and hexinyl.

The term halogen generally denotes fluorine, chlorine, bromine or iodine.

Examples of cycloalkyl groups with 3-8 carbon atoms according to the invention are selected from among cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and cyclooctyl.

Examples of 5-, 6- or 7-membered, saturated or unsaturated heterocycles which may contain nitrogen, oxygen or sulphur as heteroatoms, include, unless otherwise stated in the definitions, furan, tetrahydrofuran, tetrahydrofuranon, γ-butyrolactone, α-pyran, γ-pyran, dioxolan, tetrahydropyran, dioxane, thiophene, dihydrothiophene, thiolan, dithiolan, pyrrole, pyrroline, pyrrolidine, pyrazole, pyrazoline, pyrazolidine, imidazole, imidazoline, imidazolidine, triazole, tetrazole, pyridine, piperidine, pyridazine, pyrimidine, pyrazine, piperazine, triazine, tetrazine, morpholine, thiomorpholine, diazepan, oxazole, isoxazole, oxazine, thiazole, isothiazole, thiadiazole, oxadiazole and pyrazolidine, wherein the heterocyclic group may be substituted as stated in the definitions.

Unless otherwise specified, the two alkyl groups in the dialkylaminosubstituents —N(C₁-C₄-alkyl)₂ may be identical or different.

“═O” denotes an oxygen atom linked via a double bond.

As already mentioned, the compounds of general formula (I) according to the invention are effective as tryptase inhibitors. A further aspect of the present invention is therefore directed to the use of the compounds of general formula (I) as hereinbefore defined for preparing a pharmaceutical composition for the prevention and/or treatment of diseases in which tryptase inhibitors may be of therapeutic value.

It is preferred according to the invention to use compounds of general formula (I) for the purpose mentioned above, for preparing a pharmaceutical composition for the prevention and/or treatment of inflammatory and/or allergic diseases. It is particularly preferable to use the compounds of general formula (I) as mentioned above for preparing a pharmaceutical composition for the prevention and/or treatment of bronchial asthma, allergic rhinitis, allergic conjunctivitis, atopic dermatitis, urticaria, allergic otitis, allergic gastro-intestinal disorders, Crohn's disease, ulcerative colitis, anaphylactic shock, septic shock, shock lung (ARDS) and arthritis.

It is also advantageous to use the compounds of general formula (I) as mentioned above for preparing a pharmaceutical composition for the prevention and/or treatment of fibroses such as lung fibrosis, fibrosing alveolitis and scarring, collagenoses such as lupus erythematodes and sclerodermia as well as arteriosclerosis, psoriasis and neoplasm.

The substituted benzimidazole derivatives of formula (I) as well as the prodrugs of general formula (II) may be obtained by various methods of synthesis. Possible approaches based on and using conventional methods of chemical synthesis are hereinafter described by way of example. Diagram 1 shows one possible method of synthesising the basic benzimidazole structure of the compounds according to the invention,

In a first step (Diagram 1, step i) the 3-nitro-4-halo-anilines (1) are reacted to form the sulphonamides (2).

For this purpose the compounds (1) are taken up in a suitable organic, anhydrous solvent and combined with the desired arylsulphonic acid chloride, optionally in the presence of an organic base, while cooling. Suitable organic solvents may be halogenated hydrocarbons such as dichloromethane or chloroform as well as solvents selected from among dioxan, tetrahydrofuran, dimethylformamide, acetonitrile and pyridine. It is preferred according to the invention to use pyridine or pyridine mixed with dichloromethane or chloroform as solvent. If an organic base is added, amines such as triethylamine, diisopropylethylamine, N-methylmorpholine or pyridine are primarily used. The arylsulphonic acid chloride is preferably added at temperatures below ambient temperature, particularly between −40° C. and 20° C., most preferably at −20° C. to 10° C. After the reaction has ended (about 0.5-2 h) the mixture is worked up by conventional methods. The compounds (2) may optionally be purified by crystallisation from nonpolar organic solvents such as, for example, diethylether, petroleum ether, optionally mixed with ethyl acetate.

In a second step (Diagram 1, step ii) the sulphonamides (2) are reacted to form the compounds (3). The aminolysis of the compounds (2) with the primary amines R¹—NH₂ is carried out in suitable organic solvents such as for example dimethylsulphoxide, N,N-dimethylformamide, N-methylpyrrolidone, acetone or optionally in water or alcohols at ambient temperature or in a temperature range from 30-80° C., preferably 40-50° C.

The reduction of the nitro groups to form the compounds (4, Diagram 1, step iii) is carried out for example by catalytic hydrogenation in organic solvents such as for example methanol, ethanol, isopropanol, tetrahydroflran, optionally also in admixture with dimethylformamide, ethylacetate, dioxan or acetic acid, at elevated hydrogen pressure or at normal pressure at temperatures between 0-50° C., preferably at 20-40° C. Suitable catalysts are conventional hydrogenation catalysts. Palladium and Raney nickel are preferred. According to the invention, palladium is preferred. Palladium on charcoal (5%) is particularly preferred as the catalyst. An alternative method of reducing the nitro compounds (3) envisages the use of reduction agents such as Na₂S₂O₄ or SnCl₂. This reaction is carried out in protic, water-miscible organic solvents such as short-chained alcohols (methanol, ethanol, isopropanol) or in a mixture of the abovementioned solvents with water, optionally with acetic acid, dimethylformamide or ethylacetate. The reaction is normally carried out at elevated temperature, preferably by refluxing the solvent or solvent mixture in question. After the reaction of the starting compounds (3) is complete, the mixture is worked up in the usual way. The compounds (4) may be purified for example by crystallisation from nonpolar organic solvents such as diethylether, petroleum ether, optionally mixed with ethyl acetate.

In a fourth step (Diagram 1, step iv) cyclisation to form the benzimidazoles (5) is carried out by reacting the sulphonamide derivatives (4) with p-cyanophenylpropionic acid in the presence of dehydrating reagents. The reaction is optionally carried out in a solvent or mixture of solvents such as methylene chloride, dimethylformamide, benzene, toluene, chlorobenzene, tetrahydrofuran, benzene/tetrahydrofuran or dioxan. Suitable dehydrating agents include for example isobutyl chloroformate, tetraethyl orthocarbonate, trimethyl orthoacetate, 2,2-dimethoxypropane, tetramethoxysilan, phosphorus oxychloride, thionylchloride, trimethylchlorosilan, phosphorus trichloride, phosphorus pentoxide, ethyl 1,2-dihydro-2-ethoxy-quinoline-1-carboxylate (EEDQ), i-propyl 1,2-dihydro-2-i-propyloxy-quinoline-1-carboxylate (IIDQ), N,N′-dicyclohexylcarbodiimide, N,N′-dicyclo-hexylcarbodiimide/N-hydroxysuccinimide, N,N′-dicyclohexylcar-bodiimide/1-hydroxy-benzotriazole, 2-(1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium-tetrafluoroborate, 2-(1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium-tetrafluoroborate/1-hydroxy-benzotriazole, N,N′-carbonyldiimidazole or triphenylphosphine/carbon tetrachloride. It may be appropriate to add a base such as pyridine, 4-dimethylaminopyridine, N-methyl-morpholine or triethylamine. The reaction is usually carried out at temperatures between 0 and 150° C., preferably at temperatures between 20 and 120° C.

An alternative method of obtaining the compounds (5) is shown by way of example in Diagram 2.

Starting from the 2-halo-5-nitro-anilines (6) aminolysis may first be carried out to obtain the diaminonitrobenzenes (7) according to Diagram 2 (step v). Reacting the compounds (7) with p-cyanophenylpropionic acid leads to the nitro-benzimidazoles (8, step vi), which can be reductively converted into the amino-benzimidazoles (9) (step vii, Diagram 2). The compounds (5) may be obtained from the amino-benzimidazoles (9) by reaction with the corresponding arylsulphonic acid chlorides (Diagram 2, step viii). The synthesis outlined in Diagram 2 may be carried out experimentally analogously to the procedure described for steps i-iv (Diagram 1). Step v is carried out analogously to the method according to step ii, step vi analogously to the method according to step iv, step vii analogously to the method described for step ii and, finally, step viii according to the experimental method in step i.

Starting from the benzimidazoles (5) which may be obtained according to Diagrams 1 and 2, the intermediates of formula (III) (cf. Diagram 3) are obtained by reaction with the compounds R⁴—Nu, where Nu denotes a nucleofugic leaving group such as for example chlorine, bromine, iodine, methanesulphonate, methyltriflate, p-toluenesulphonate etc.

Alternatively, the intermediates (III) may be obtained from the compounds (5) by reductive amination by reacting with correspondingly substituted ketones or aldehydes under reductive conditions.

In order to react the compounds (5) with R⁴—Nu according to step x the following procedure is used. A compound (5) is dissolved in a polar solvent, such as dimethylformamide, dimethylactamide, methylene chloride, tetrahydrofliran, preferably dimethylformamide and most preferably anhydrous, possibly absolute dimethylformamide. The solution thus obtained is combined with a base and the corresponding alkylating agent R⁴—Nu. The base used may be an alkali or alkaline earth metal carbonate of lithium, sodium, potassium, calcium such as sodium carbonate, lithium carbonate, potassium carbonate, calcium carbonate and preferably potassium carbonate. It is also possible to use the alkali or alkaline earth metal hydroxides of lithium, sodium, potassium, magnesium, calcium, but preferably sodium hydroxide, potassium hydroxide, lithium hydroxide and calcium hydroxide in alcohol or water. The reaction mixture is stirred for 0.5-8 h, preferably 1-4 h at elevated temperature, preferably at 50-120° C., particularly at the reflux temperature of the solvent used. After the reaction is complete the mixture is worked up in the usual way and the crude product obtained is purified by crystallisation or chromatography on silica gel.

If the intermediates (III) are obtained from the compounds (5) by reductive amination, the following procedure is used. The compound (5) is dissolved in a suitable solvent such as for example dichloromethane, dichloroethane, methanol, ethanol, tetrahydrofuran or toluene, and at between 0-60° C., preferably at 20-40° C., the corresponding carbonyl compound is added in the presence of an acid, preferably a carboxylic acid, most preferably a short-chained carboxylic acid, particularly acetic acid. Then a suitable reduction agent is added. Suitable reduction agents which may be used according to the invention are Na[HB(OAc)₃], Na[BH₃CN], NaBH₄, Pd/C—H₂, preferably Na[HB(OAc)₃]. After working up in the usual way the product is purified by crystallisation or chromatography on silica gel.

According to step xi the compounds of general formula (I) according to the invention may be obtained from the intermediates (III). Various methods may be used to prepare the compounds of general formula (I) according to the invention wherein R² denotes —C(═NH)NH₂.

A compound of general formula (I) is obtained for example by treating a compound of general formula (III) with a corresponding alcohol such as methanol, ethanol, n-propanol, isopropanol or benzylalcohol optionally mixed with another organic solvent such as for example chloroform, nitrobenzene or toluene in the presence of an acid such as hydrochloric acid or by reacting a corresponding amide with a trialkyloxonium salt such as triethyloxonium tetrafluoroborate in a solvent such as methylene chloride, tetrahydrofuran or dioxan at temperatures between −10 and 50° C., but preferably at 0-20° C. and subsequent aminolysis with alcoholic ammonia solution, for example. Alternatively, the compounds of general formula (I) may be obtained by reacting a compound of general formula (III) with sulphur nucleophiles such as e.g. hydrogen sulphide, ammonium or sodium sulphide, sodium hydrogen sulphide, carbon disulphide, thioacetamide or bistrimethylsilylthioether, optionally in the presence of bases such as triethylamine, ammonia, sodium hydride or sodium alkoxide in solvents such as methanol, ethanol, water, tetrahydrofrran, pyridine, dimethylformamide or 1,3-dimethyl-imidazolidin-2-one at 20-100° C., and subsequent treatment with a suitable methylating agent such as e.g. methyliodide or dimethylsulphate in a solvent such as acetonitrile or acetone at temperatures between −10 and 50° C., but preferably at 0-20° C., and subsequent treatment with ammonia, ammonium carbonate or ammonium chloride in a suitable alcohol, such as for example methanol, ethanol, isopropanol etc. at temperatures between −10 and 50° C., but preferably at 0-20° C.

Moreover, the compounds of general formula (I) according to the invention may be obtained by treating a compound of general formula (III) with lithiumhexamethyl disilazide in a suitable organic solvent such as e.g. tetrahydrofuran at temperatures between −20 and 50° C., but preferably at 0-20° C. and subsequently hydrolysing with dilute hydrochloric acid at 0-5° C.

Another alternative method of obtaining compounds of general formula (I) is by treating a compound of general formula (III) with ammonium chloride and trimethylaluminium in a suitable organic solvent such as e.g. toluene at temperatures between 20 and 150° C., but preferably at 110° C.

Compounds of general formula (I) wherein R² denotes —CH₂—NH₂ may be obtained from the intermediates (III) for example by catalytic hydrogenation on Raney nickel. These reactions are preferably carried out in protic organic solvents such as short-chained alcohols (methanol, ethynol or isopropanol) at temperatures between 10-40° C., preferably at 20-30° C. under normal pressure.

A compound of general formula (II) is obtained for example by treating a compound of general formula (III, Diagram 3, step xii) with hydroxylamine in the presence of carbonates or alkoxides of alkali or alkaline earth metals in solvents such as methanol, ethanol, n-propanol or isopropanol optionally in admixture with dioxan or tetrahydrofuran. The alkoxides may be prepared from the respective alkali metals or metal hydrides and the corresponding alcohol. The reaction is preferably carried out at 20-100° C., most preferably at the boiling temperature of the solvent used.

Compounds of general formula (II) may alternatively be obtained by treating a compound of general formula (III) with a corresponding alcohol such as methanol, ethanol, n-propanol, isopropanol or benzylalcohol in the presence of an acid such as hydrochloric acid or by reacting a corresponding amide with a trialkyloxonium salt such as triethyloxonium-tetrafluoroborate in a solvent such as methylene chloride, tetrahydrofaran or dioxan at temperatures between −10 and 50° C., but preferably at 0-20° C. and subsequently treating with hydroxylamine in the presence of bases in a suitable alcohol, such as methanol, ethanol, isopropanol etc. at temperatures between −10 and 50° C., but preferably at 0-200° C.

A compound of general formula (I) is obtained for example by treating a compound of general formula (II, Diagram 3, step xiii) with hydrogen in the presence of hydrogenation catalysts such as Raney nickel or rhodium/aluminium oxide in water or methanol optionally with the addition of acids such as hydrochloric acid or methanesulphonic acid or by treating with hydrogen in the presence of palladium/charcoal in acetic acid/acetic anhydride at 20-50° C. and 1-5 bar hydrogen pressure, preferably at ambient temperature and normal pressure.

The acyl- or alkoxycarbonyl prodrugs (II) of the compound of general formula (I) are obtained by reacting the compounds of general formula (I) with the corresponding acid chlorides in the presence of bases such as e.g. triethylamine, N-methylmorpholine, diethylisopropylamine or DBU in a suitable solvent such as methylene chloride, chloroform, tetrahydrofuran, acetonitrile, dimethylformamide or dimethylsulphoxide.

In accordance with their central role in the synthesis of the compounds of general formula (I) according to the invention as well as the synthesis of the prodrugs of general formula (II), a further aspect of the present invention is directed to the intermediates of general formula (III).

wherein the groups R¹, R³ and R⁴ may be as hereinbefore defined. The compounds of general formula (III) are valuable intermediates for preparing the benzimidazole derivatives of general formula (I) according to the invention as well as the prodrugs of general formula (II) according to the invention.

Procedures by way of example for preparing the compounds according to the invention will be described in more detail hereinafter. The Examples which follow serve solely as a detailed illustration without restricting the subject matter of the invention.

EXAMPLE 1 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-ethoxycarbonyl-benzenesulphonamide)-hydrochloride

a) N¹-methyl-1,2-diamino-4-nitrobenzene

2-fluoro-5-nitro-aniline (15.0 g, 160 mmol) is taken up in 480 mL of 40% aqueous methylamine solution, stirred for 2.5 days at ambient temperature and for 2 h at 40-50° C. It is diluted with water, the solid is filtered off, washed with water and dried.

Yield: 26 g (97%); m.p.: 171-173° C.;

b) 2-[2-(4-Cyanophenyl)-ethyl]-1-methyl-5-nitro-benzimidazole

N¹-methyl-1,2-diamino-4-nitrobenzene (8.3 g, 49.6 mmol) and p-cyano-phenylpropionic acid (9.6 g, 55 mmol) are taken up in 90 mL POCl₃, and refluxed for 1.5 h. After cooling, the excess POCl₃ is decomposed with ice water. It is made alkaline with NH₃ with stirring/cooling and stirred for 1 h at ambient temperature. The solid is filtered off, washed with water and recrystallised from DMF.

Yield: 11.7 g (76%); m.p.: 202-204° C.;

c) 5-amino-2-[2-(4-cyanophenyl)-ethyl]-1-methyl-benzimidazole

2-[2-(4-Cyanophenyl)-ethyl]-1-methyl-5-nitro-benzimidazole (5.5 g, 18 mmol) in 150 mL THF/75 mL methanol is hydrogenated in the presence of 1.0 g of 5% Pd/C at ambient temperature and normal pressure. The catalyst is filtered off, the filtrate is evaporated not quite to dryness, diluted with 100 mL acetonitrile and evaporated down to a residual volume of 30 mL. The crystal slurry is cooled and filtered. The crystals are washed with cold acetonitrile and ether.

Yield: 4.7 g (94%); m.p.: 187-192° C.;

d) N-{2-[2-(4-Cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-(4-carboxy-benzenesulphonamide)

10 mmol of 5-amino-2-[2-(4-cyanophenyl)-ethyl]-1-methyl-benzimidazole are taken up in 10 mL pyridine and cooled to 10° C. The benzenesulphonic acid chloride (about 11 mmol) is added dropwise with stirring within about 20 min at 10-20° C. The mixture is stirred for 30 min. at RT and poured onto ice water. After acidification with conc. HCl it is extracted with 50 mL ethyl acetate, washed with water, dried and concentrated by evaporation. The residue remaining is purified by chromatography on silica gel.

Yield: 48%; m.p.: 158-160° C.;

e) N-{2-[2-(4-Cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-(4-ethoxycarbonyl-benzenesulphonamide)

N-{2-[2-(4-Cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-(4-carboxy-benzenesulphonamide) (2.0 g, 4.3 mmol) is refluxed in 10 mL thionyl chloride for 1.5 h. The mixture is diluted with 50 mL ethyl acetate, the crystalline hydrochloride of the acid chloride is filtered off and washed with ethyl acetate/diethylether. The solid is suspended in 40 mL ethanol and slowly brought to reflux temperature. Half the ethanol is distilled off, the remainder is cooled and combined with ice water and made alkaline with aqueous potassium carbonate solution with stirring. It is diluted with water, the solid is filtered off and washed with water.

Yield: 1.8 g (85%); m.p.: 160-163° C.;

f) N-{2-[2-(4-Cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-ethoxycarbonyl-benzenesulphonamide)

6.1 mmol of N-{2-[2-(4-cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl }-(4-ethoxycarbonyl-benzenesulphonamide), diethylaminoethyl chloride (1.2 g, 7.0 mmol), 4.0 g potassium carbonate and catalytic quantities of potassium iodide are refluxed in 50 mL dimethylfomamide for about 1.5 h. After cooling the mixture is poured onto ice water, extracted with 100 mL ethyl acetate, dried and concentrated by evaporation. The residue is filtered with dichloromethane/methanol through a silica gel column. After evaporation, the residue is crystallised from acetone/diethylether.

Yield: 80%; m.p.: 110-112° C.;

g) N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-ethoxycarbonyl-benzenesulphonamide)-hydrochloride

5.7 mmol of N-{2-[2-(4-cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-ethoxycarbonyl-benzenesulphonamide) are taken up in about 120 mL of a saturated ethanolic HCl solution cooled to 0° C. The mixture is stirred until the educt is fully dissolved and then kept overnight at 0-5° C. The ethanol is distilled off at a maximum of 40° C. and the residue is taken up in 100 mL of a saturated ethanolic ammonia solution at 0° C. It is stirred for 2 h at ambient temperature, for 3 h at 50-60° C., combined with another 30 mL of saturated ammonia solution and refluxed for 2 h. It is combined with 50 mL water and 60 mL ethyl acetate and stirred for 30 min. at ambient temperature. After the solvent has been distilled off in vacuo the residue remaining is purified by chromatography on silica gel.

Yield: 76% (amorphous solid);

Mass: calc.: [604], found: [M+H]⁺605;

¹H-NMR (250 MHz, DMSO-d6): δ=9.25; 9.02 (4H, 2s, —C(═NH₂ ⁺)NH₂); 8.13-6.80 (11H, m, aryl-H); 4.35 (2H, qu, J=7.0 Hz, OCH₂CH₃); 3.71 (3H, s, N—CH₃); 3.36 (4H, s, —CH₂—CH₂—); 2.48 (4H, m, N—(CH₂—CH₃)₂); 1.34 (3H, t, J=7.0 Hz, OCH₂CH₃); 0.94 (6H, m, N—(CH₂—CH₃)₂).

EXAMPLE 2 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)-dihydrochloride

a) N-{2-[2-(4-Cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-(dansylamide)

The reaction is carried out starting with 8 mmol of 5-amino-2-[2-(4-cyanophenyl)-ethyl]-1-methyl-benzimidazole (obtainable according to Example 1, step c) analogously to the method described in Example 1, step d. The product is obtained by crystallisation from ethyl acetate.

Yield: 83%; m.p.: 216-218° C.;

b) N-{2-[2-(4-Cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)

The reaction is carried out starting with 3.9 mmol of N-{2-[2-(4-cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-(dansylamide) analogously to the method described in Example 1, step f, in dimethylformamide as solvent. The product is obtained by crystallisation from ethyl acetate/diethylether.

Yield: 80%; m.p.: 143-145° C.;

c) N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-dietbylaminoethyl-(dansylamide)-dihydrochloride

The reaction is carried out starting with 3.0 mmol of N-{2-[2-(4-cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide) analogously to the method described in Example 1, step g. The product is obtained by chromatography on silica gel.

Yield: 70% (amorphous solid);

Mass: calc.: [625], found: [M+H]⁺626;

¹H-NMR (250 MHz, DMSO-d6): δ=9.43; 9.25 (4H, 2d, —C(═NH₂ ⁺)NH₂); 8.60-6.91 (13H, m, aryl-H); 4.00; 2.78 (4H, 2m, N—CH₂CH₂N); 3.73 (3H, s, N—CH₃); 3.22 (4H, s, —CH₂—CH₂—); 2.84 (6H, s, N—(CH₃)₂); 2.76 (4H, m, N—(CH₃CH₃)₂; 0.94 (6H, m, N—(CH₂CH₃)₂).

Unless otherwise stated, the compounds described as follows, inter alia, were obtained analogously to the processes described above or by known standard methods.

EXAMPLE 3 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-bromo-benzenesulphonamide)-hydrochloride

Mass: calc.: [611], found: [M+H]⁺611/613;

EXAMPLE 4 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-nitro-benzenesulphonamide)-hydrochloride

Yield: 83% (amorphous solid);

Mass: : calc.: [577], found: [M+H]⁺578

¹H-NMR (250 MHz, DMSO-d6): δ=9.65; 9.47 (4H, 2s, —C(═NH₂ ⁺)NH₂); 8.64-7.04 (11H, m, aryl-H); 4.00; 2.80 (4H, 2m, N—CH₂CH₂—N); 3.84 (3H, s, N—CH₃); 3.52 (4H, s, —CH₂—CH₂—); 3.24 (4H, m, N—(CH₂CH₃)₂); 1.02 (6H, m, N—(CH₂CH₃)₂).

EXAMPLE 5 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-methoxy-benzenesulphonamide)-hydrochloride

Mass: calc.: [562], found: [M+H]⁺ 563, [M+2H]²⁺ 282.

¹H-NMR (250 MHz; DMSO-d6): δ=10.80; 9.45; 9.28 (5H, 3s, H⁺; —C(═NH₂ ⁺)NH₂); 7.49-6.93 (11H, m, aryl-H); 4.10; 3.14 (4H, 2m, N—CH₂CH₂—N); 3.78 (3H, S, N—CH₃); 3.74 (3H, S, OCH₃); 3.27 (4H, S, —CH₂—CH₂—); 3.12 (4H, m, N—(CH₂CH₃)₂; 1.14 (6H, t, J=7.0 Hz, N—(CH₂—CH₃)₂).

EXAMPLE 6 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-methyl-benzenesulphonamide)-hydrochloride

Mass: calc.: [546], found: [M+H]⁺ 547, [M+2H]²⁺ 274.

¹H-NMR (250 MHz, DMSO-d6): δ=7.75-6.92 (11H, m, aryl-H); 4.03; 3.28 (4H, 2m, N—CH₂CH₂—N); 3.72 (3H, s, N—CH₃); 3.25 (4H, s, —CH₂—CH₂); 3.21 (4H, m, N—(CH₂CH₃)₂); 2.35 (3H, s, 0-CH₃); 1.27 (6H, t, J=7.0 Hz, N—(CH₂CH₃)₂).

EXAMPLE 7 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-chloro-benzenesulphonamide)-hydrochloride

Mass: calc.: [567], found: [M+H]⁺ 567, 569

¹H-NMR (250 MHz, DMSO-d6): δ=10.76; 9.42; 9.24 (5H, 3s, H⁺; —C(═NH₂ ⁺)NH₂); 7.90-6.90 (11H, m, aryl-H); 4.13; 3.14 (4H, 2m, N—CH₂CH₂—N); 3.76 (3H, s, N—CH—₃); 3.25 (4H, s, —CH₂CH₂—); 3.14 (4H, m, N—(CH₂CH₃)₂; 1.76 (6H, m, N—(CH₂—CH₃)₂).

EXAMPLE 8 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-amino-benzenesulphonamide)-tetrahydrochloride

3.9 mmol of N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-nitro-benzenesulphonamide) (Example 4) are hydrogenated on PD/C (5%) in pure MeOH at normal pressure and ambient temperature. The title compound is crystallised from methanol/isopropanol with concentrated hydrochloric acid.

Yield: 74%; m.p.: 190-205° C.;

Mass: calc.: [547], found: [M+H]⁺ 548

¹H-NMR (250 MHz, DMSO-d6): δ=9.49; 9.32 (4H, 2s, —C(═NH₂ ⁺)NH₂); 7.25-6.57 (11H, m, aryl-H); 6.19 (2H, s, NH₂); 3.76 (3H, s, N—CH₃); 3.27 (4H, s, —CH₂—CH₂—); 2.77 (4H, m, N—(CH₂CH₃)₂; 0.99 (6H, m, N—(CH₂—CH₃)₂).

EXAMPLE 9 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-acetylamino-benzenesulphonamide)

1.4 g (2.4 mmol) of N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-amino-benzenesulphonamide)-tetrahydrochloride (Example 8) is kept in 5 mL ethyl acetate and 0.5 mL acetanhydride for 1 h at ambient temperature, briefly heated to 30-40° C. and left for a further 16 h at ambient temperature. The mixture is combined with 10 mL water and concentrated by evaporation. The residue is taken up in water and made alkaline with aqueous potassium carbonate solution. After the addition of 5 mL of ethyl acetate the mixture is stirred thoroughly and after 1 hour the solid precipitate is filtered off and washed with water, ethyl acetate and diethylether. Yield: 88%;

Mass: calc.: [589], found: [M+H]⁺ 590

¹H-NMR (250 MHz, DMSO-d6): δ=7.97-6.93 (11H, m, aryl-H); 3.75 (3H, s, N—CH₃); 3.21 (4H, s, —CH₂CH₂—); 2.43 (4H, qu, J=7.0 Hz, N—(CH₂CH₃)₂); 2.13 (3H, s, CH₃—C═)); 0.85 (6H, t, J=7.0 Hz, N—(CH₂CH₃)₂).

EXAMPLE 10 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-chloro-benzenesulphonamide)

Yield: 79%; m.p.: 88-90° C.;

Mass: calc.: [567], found: [M+H]⁺ 567/569 (1 Cl)

₁H-NMR (250 MHz, CD₃OD): δ=7.67-6.96 (12H, m, aryl-H); 3.76; 2.59 (4H, 2m, N—CH₂—CH₂—N); 3.63 (3H, s, N—CH₃); 3.21 (4H, m, —CH₂CH₂—); 2.51 (4H, qu, J=7.0 Hz, N—(CH₂CH₃)₂; 0.95 (6H, t, J=7.0 Hz, N—(CH₂—CH₃)₂).

EXAMPLE 11 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-[4-ethoxycarbonylmethylaminocarbonyl-benzenesulphonamide]-hydrochloride

Yield: 42%;

Mass: calc.: [661], found: [M+H]⁺ 662

¹H-NMR (250 MHz, DMso-d6): δ=9.30; 9.11 (4H, 2s, —C(═NH₂ ⁺)NH₂); 9.27 (1H, t, J=5.8 Hz, NH—CH₂); 8.09-6.79 (11H, m, aryl-H); 4.12 (2H, qu, J=7.0 Hz; O—CH₂CH₃); 4.02 (2H, d, J=5.8 Hz, NH—CH₂—); 3.72 (3H, s, N—CH₃); 2.88 (4H, 2m, N—CH₂CH₂—N); 3.22 (4H, s, CH₂CH₂—); 1.23 (3H, t, J=7.0 Hz, OCH₂CH₃); 1.02 (6H, m, N—(CH₂ CH₃)₂; 2.88 (4H, m, N—(CH₂CH₃)₂).

EXAMPLE 12 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(4-methoxy-benzenesulphonamide)-trihydrochloride

1.0 g (1.7 mmol) of N-{2-[2-(4-(amino-hydroximinomethyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl }-N-diethylaminoethyl-(4-methoxy-benzenesulphonamide) (obtainable analogously to the method described in Example 16) are taken up in 30 mL of acetic acid and 0.5 mL acetanhydride and hydrogenated in the presence of 5% Pd/C (0.3 g) at normal pressure. The catalyst is filtered off, the filtrate is evaporated down after the addition of 5 mL water and the residue is chromatographed over silica gel. The trihydrochloride is precipitated from ethanol/acetone with concentrated hydrochloric acid and washed with ethanol/acetone.

Yield: 0.6 g (52%); m.p.: 190-200° C.;

Mass: calc.: [562], found: [M+H]⁺ 563

¹H-NMR (250 MHz, CD₃OD): δ=7.17 (11H, m, aryl-H); 4.19; 3.36 (4H, 2m, N—CH₂—CH₂—N); 4.05 (3H, s, OCH₃); 3.95 (3H, s, N—CH₃); 3.38 (4H, N—(CH₂CH₃)₂); 3.68; 3.36 (4H, 2m, —CH₂CH₂—); 1.34 (6H, t, J=7.0 Hz, N—(CH₂CH₃)₂).

EXAMPLE 13 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-methyl-(dansylamide)-hydrochloride

Yield: 73%; m.p.: 222-225° C.;

Mass: calc.: [540], found: [M+H]⁺ 541.

EXAMPLE 14 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-[4-carboxy-benzenesulphonamide]-fumarate

m.p.: 200-204° C.;

Mass: calc.: [576], found: [M+H]⁺ 577;

¹H-NMR (250 MHz, DMSO-d6): δ=11.32; 9.36 (6H, 2s, H⁺; —C(═NH₂ ⁺)NH₂); 8.36-7.09 (11H, m, aryl-H); 6.77 (2H, s, fumaric acid); 3.92; 2.74 (4H, 2m, N—CH₂CH₂N); 3.89 (3H, s, N—CH₃); 3.44 (4H, s, —CH₂—CH₂—); 2.76 (4H, m, N—(CH₂CH₃)₂; 1.07 (6H, t, J=7.0 Hz, N—(CH₂CH₃)₂).

EXAMPLE 15 N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-[4-carboxymethylaminocarbonyl-benzenesulphonamide]

m.p.: 205-210° C.;

Mass: calc.: [633], found: [M+H]⁺ 634

¹H-NMR (250 MHz, CD₃OD): δ=8.04-6.94 (11H, m, aryl-H); 2H, s, N—CH₂; 3.88; 2.62 (4H, 2s, N—CH₂CH₃—N); 3.70 (3H, s, N—CH₃); 3.30 (4H, s, —CH₂CH₂—); 2.53 (4H, qu, J=7.0 Hz, N—(CH₂CH₃)₂); 0.95 (6H, t, J=7.0 Hz, N—(CH₂CH₃)₂).

The following Table summarises other compounds of general formula (I) synthesised according to the invention analogously to the Examples described hereinbefore.

TABLE 2 No —R³ —R⁴ Chemical name 16

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-diethylaminoethyl- [3,5-di-(trifluoromethyl)- benzenesulphonamide] dihydrochloride 17

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-diethylaminoethyl- (6-hydroxy-naphth-2-ylsulphonamide) dihydrochloride 18

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-diethylaminoethyl- (3-trifluoromethyl-benzenesulphonamide) dihydrochloride 19

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-diethylaminoethyl- [3-(1-methyl-1-phenyl-ethyl)- benzenesulphonamide] dihydrochloride 20

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-aminoethyl- (dansylamide) dihydrochloride 21

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-diethylaminoethyl-(4- tert-butyl-benzenesulphonamide) dihydrochloride 22

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-pyrid-2-ylmethyl- (dansylamide) dihydrochloride 23

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-pyrid-3-ylmethyl- (dansylamide) dihydrochloride 24

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-diethylaminoethyl-(8- chloronaphth-1-ylsulphonamide) dihydrochloride 25

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-pyrid-4-ylmethyl- (dansylamide) dihydrochloride 26

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-benzyl-(4-tert-butyl- benzenesulphonamide) dihydrochloride 27

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-diethylaminoethyl-(6- methoxy-naphth-2-ylsulphonamide) diacetate 28

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-diethylaminoethyl- (3-nitro-benzenesulphonamide) dihydrochloride 29

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-diethylaminoethyl- (3-amino-benzenesulphonamide) dihydrochloride 30

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-diethylaminoethyl- (4-trifluoromethyl-benzenesulphonamide) dihydrochloride 31

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-ethylaminoethyl- (dansylamide) dihydrochloride 32

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-ethylaminoethyl-(5- amino-naphth-1-ylsulphonamide) dihydrochloride 33

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-diethylaminoethyl- (5-amino-naphth-1-ylsulphonamide) dihydrochloride 34

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl- benzimidazol-5-yl}-N-2-diethylaminoethyl- (5-chloro-naphth-1-ylsulphonamide) dihydrochloride

EXAMPLE 35 N-{2-[2-(4-amino-hydroximinomethyl)phenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)

2.3 mmol of N-{2-[2-(4-cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide), which may be obtained analogously to Example 1 (steps a-f), NH₂OH*HCl (1.0 g) and Na₂CO₃ (1.7 g) are refluxed for 2 h in 40 mL methanol/tetrahydrofuran. The solvent is distilled off, the residue is taken up in water and extracted with ethyl acetate. It is purified by chromatography on silica gel.

Yield: 47%;

Mass: calc.: [641], found: [M+]⁺ 642, [M+2H]²⁺ 322

¹H-NMR (250 MHz,DMSO-d6): δ=9.66 (1H,s,OH); 8.62-6.96 (13H,m,aryl-H); 5.83 (2H,s,NH₂); 3.77; 2.40 (4H,2m,N—CH₂CH₂—N); 3.69 (3H,s,N—CH₃); 3.15 (4H,s,—CH₂—CH₂—); 2.87 (6H,s,N—(CH₃)₂); 2.36 (4H,m,N—(CH ₂CH₃)₂); 0.78 (6H,m,N—(CH₂—CH ₂)₂).

EXAMPLE 36 N-{2-[2-(4-amino-hydroximinomethyl)phenyl-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-bromo-benzenesulphonamide)

The title compound is prepared starting from N-{2-[2-(4-cyanophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(3-bromo-benzene-sulphonamide) analogously to the method described in Example 16.

m.p.: 156° C.;

Mass calc.: [627], found: [M+]⁺ 627/629, [M+2H]²⁺ 315.

EXAMPLE 37 N-{2-[2-(4-(amino-benzoylimino-methyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)

N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl }-N-diethylaminoethyl-(dansylamide)-dihydrochloride (Example 2, 3.0 mmol) and TEA (48 mmol) in 100 mL CH₂Cl₂ are combined with benzoyl chloride (3.3 mmol) at ambient temperature, with stirring. The mixture is stirred at ambient temperature until the reaction is complete, diluted with 50 mL CH₂Cl₂, washed with water, dried and concentrated by evaporation. The product is purified by crystallisation from t-butyl-methyl-ether.

Mass: calc.: [729], found: [M+]⁺ 730, [M+2H]²⁺ 365

EXAMPLE 38 N-{2-[2-(4-(amino-nicotinoylimino-methyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl}N-diethylaminoethyl-(dansylamide)

Starting from N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)-dihydrochloride (Example 2) the desired compound is synthesised analogously to the method described in Example 18 using pyridine-3-carboxylic acid chloride.

Mass: calc.: [730], found: [M+]⁺ 731, [M+2H]²⁺ 366.

EXAMPLE 39 N-{2-[2-(4-(amino-methyloxycarbonylimino-methyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)

Starting from N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)-dihydrochloride (Example 2) the desired compound is synthesised analogously to the method described in Example 18 using methyl chloroformate.

Mass: calc.: [683], found: [M+]⁺ 684, [M+2H]²⁺ 342.

EXAMPLE 40 N-{2-[2-(4-(amino-etbyloxycarbonylimino-methyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)

1.9 mmol of N-{2-[2-(4-amidinophenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide) (Example 2) in 20 mL dimethylformamide are combined with ethyl chloroformate (0.9 mmol) at ambient temperature, with stirring. The mixture is stirred for 1 h at ambient temperature, diluted with 75 mL ethyl acetate, washed with dilute NaOH solution and water, dried and concentrated by evaporation. The product is purified by chromatography over silica gel and optionally crystallised from ethyl acetate/diethylether.

Yield. 0.6 g (93%); m.p.: 136-139° C.;

Mass: calc.: [697], found: [M+]⁺ 698, [M+2H]²⁺ 349.

EXAMPLE 41 N-{2-[2-(4-(amino-propyloxycarbonylimino-methyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)

Mass: calc.: [711], found: [M+]⁺ 712, [M+2H]²⁺ 357.

EXAMPLE 42 N-{2-[2-(4-(amino-iso-butyloxycarbonylimino-methyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(dansylamide)

Mass: calc.: [725], found: [M+]⁺ 726, [M+2H]²⁺ 364.

EXAMPLE 43 N-{2-[2-(4-Amino-hydroximinomethyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(6-hydroxy-naphth-2-ylsulphonamide)

EXAMPLE 44 N-{2-[2-(4-(Amino-iso-butyloxycarbonylimino-methyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl}-N-diethylaminoethyl-(8-chloronaphth-1-ylsulphonamide)

EXAMPLE 45 N-{2-[2-(4-(Amino-iso-butyloxycarbonylimino-methyl)-phenyl)-ethyl]-1-methyl-benzimidazol-5-yl }-N-diethylaminoethyl-(3,5-di-(trifluoromethyl)-benzene-sulphonamide)

The compounds according to the invention are characterised by their tryptase-inhibiting activity. This ability to inhibit tryptase was investigated using the test described below.

The measurement is carried out in Tris HCl buffer (100 mM), which additionally contains calcium (5 mM) and heparin (100 mg/ml), at pH 7.4. The standard used is rh beta tryptase which may be obtained commercially from Promega, for example. The substrate used is N-p-tosyl-Gly-Pro-Lys-para-nitroaniline in a concentration of 0.6 mM. The substrate is digested with tryptase to form p-nitroaniline which can be measured at 405 nm. Usually, an incubation period of 5 minutes and an incubation temperature of 37° C. are chosen. The enzyme activity used is 0.91 U/ml. The measurements are carried out in an Autoanalyser (Cobas Bio) made by Hofmann LaRoche. The potential inhibitory substances are used in concentrations of 10 μM in the screening, the inhibition of the tryptase being given in percent. The IC₅₀ is determined at over 70% inhibition (concentration at which 50% of the enzyme activity is inhibited). After 5 minutes pre-incubation of the potential inhibitory substances, the substrate is added to start the reaction, the formation of p-nitroaniline being taken as a measurement of the enzyme activity after 5 minutes, after testing the linearity.

The data obtained after carrying out the tests described above (IC50 values) can be found in Table 2.

TABLE 2 IC₅₀ Example [μM] 1 0.0097 2 0.O11 3 0.017 4 0.023 5 0.024 6 0.03 7 0.03 8 0.034 9 0.044 10 0.049 16 0.025 17 0.280 18 0.043 19 0.0088 20 0.022 21 0.0041 22 0.014 23 0.013 24 0.013 25 0.036 26 0.0076 27 0.0173 28 0.044 29 0.052

The tryptase inhibitors according to the invention may be administered orally, transdermally, by inhallation or parenterally. The compounds according to the invention occur as active ingredients in conventional preparations, for example in compositions which consist essentially of an inert pharmaceutical carrier and an effective dose of the active substance, such as for example tablets, coated tablets, capsules, powders, solutions, suspensions, emulsions, syrups, suppositories, transdermal systems etc.. An effective dose of the compounds according to the invention is between 1 and 100, preferably between 1 and 50, most preferably between 50-30 mg/dose for oral administration, and between 0.001 and 50, preferably between 0.1 and 10 mg/dose for intravenous or intramuscular administration. For inhalation, according to the invention, solutions containing 0.01 to 1.0, preferably 0.1 to 0.5% active substance are suitable. For administration by inhalation the use of powders is preferred. It is also possible to use the compounds according to the invention as a solution for infusion, preferably in a physiological saline or nutrient saline solution.

The compounds according to the invention may be used on their own or in conjunction with other active substances according to the invention, optionally also in conjunction with other pharmacologically active substances. Suitable preparations include for example tablets, capsules, suppositories, solutions, elixirs, emulsions or dispersible powders.

Suitable tablets may be obtained, for example, by mixing the active substance(s) with known excipients, for example inert diluents such as calcium carbonate, calcium phosphate or lactose, disintegrants such as corn starch or alginic acid, binders such as starch or gelatine, lubricants such as magnesium stearate or talc and/or agents for delaying release, such as carboxymethyl cellulose, cellulose acetate phthalate, or polyvinyl acetate. The tablets may also comprise several layers.

Coated tablets may be prepared accordingly by coating cores produced analogously to the tablets with substances normally used for tablet coatings, for example collidone or shellac, gum arabic, talc, titanium dioxide or sugar. To achieve delayed release or prevent incompatibilities the core may also consist of a number of layers. Similarly the tablet coating may consist of a number or layers to achieve delayed release, possibly using the excipients mentioned above for the tablets.

Syrups or elixirs containing the active substances or combinations thereof according to the invention may additionally contain a sweetener such as saccharine, cyclamate, glycerol or sugar and a flavour enhancer, e.g. a flavouring such as vanilline or orange extract. They may also contain suspension adjuvants or thickeners such as sodium carboxymethyl cellulose, wetting agents such as, for example, condensation products of fatty alcohols with ethylene oxide, or preservatives such as p-hydroxybenzoates.

Solutions for injection are prepared in the usual way, e.g. with the addition of preservatives such as p-hydroxybenzoates, or stabilisers such as alkali metal salts of ethylenediamine tetraacetic acid, and transferred into injection vials or ampoules.

Capsules containing one or more active substances or combinations of active substances may for example be prepared by mixing the active substances with inert carriers such as lactose or sorbitol and packing them into gelatine capsules.

Suitable suppositories may be made for example by mixing with carriers provided for this purpose, such as neutral fats or polyethyleneglycol or the derivatives thereof.

A therapeutically effective daily dose is between 1 and 800 mg, preferably 10-300 mg per adult.

The Examples which follow illustrate the present invention without restricting its scope:

EXAMPLES OF PHARMACEUTICAL FORMULATIONS

A) Tablets per tablet active substance 100 mg lactose 140 mg corn starch 240 mg polyvinylpyrrolidone 15 mg magnesium stearate 5 mg 500 mg

The finely ground active substance, lactose and some of the corn starch are mixed together. The mixture is screened, then moistened with a solution of polyvinylpyrrolidone in water, kneaded, wet-granulated and dried. The granules, the remaining corn starch and the magnesium stearate are screened and mixed together. The mixture is compressed to produce tablets of suitable shape and size.

B) Tablets per tablet active substance 80 mg corn starch 190 mg lactose 55 mg microcrystalline cellulose 35 mg polyvinylpyrrolidone 15 mg sodium-carboxyrnethyl starch 23 mg magnesium stearate 2 mg 400 mg

The finely ground active substance, some of the corn starch, lactose, microcrystalline cellulose and polyvinylpyrrolidone are mixed together, the mixture is screened and worked with the remaining corn starch and water to form a granulate which is dried and screened. The sodium-carboxymethyl starch and the magnesium stearate are added and mixed in and the mixture is compressed to form tablets of a suitable size.

C) Coated tablets per coated tablet Active substance 5 mg Corn starch 41.5 mg Lactose 30 mg Polyvinylpyrrolidone 3 mg Magnesium stearate 0.5 mg 80 mg

The active substance, corn starch, lactose and polyvinylpyrrolidone are thoroughly mixed and moistened with water. The moist mass is pushed through a screen with a 1 mm mesh size, dried at about 45° C. and the granules are then passed through the same screen. After the magnesium stearate has been mixed in, convex tablet cores with a diameter of 6 mm are compressed in a tablet-making machine . The tablet cores thus produced are coated in known manner with a covering consisting essentially of sugar and talc. The finished coated tablets are polished with wax.

D) Capsules per capsule Active substance 50 mg Corn starch 268.5 mg Magnesium stearate 1.5 mg 320 mg

The substance and corn starch are mixed and moistened with water. The moist mass is screened and dried. The dry granules are screened and mixed with magnesium stearate. The finished mixture is packed into size 1 hard gelatine capsules.

E) Ampoule solution active substance 50 mg sodium chloride 50 mg water for inj. 5 ml

The active substance is dissolved in water at its own pH or optionally at pH 5.5 to 6.5 and sodium chloride is added to make it isotonic. The solution obtained is filtered free from pyrogens and the filtrate is transferred under aseptic conditions into ampoules which are then sterilised and sealed by fusion. The ampoules contain 5 mg, 25 mg and 50 mg of active substance.

F) Suppositories Active substance 50 mg Solid fat 1650 mg 1700 mg

The solid fat is melted. The ground active substance is homogeneously dispersed at 40° C. It is cooled to 38 C. and poured into slightly chilled suppository moulds. 

What is claimed is:
 1. A compound of the formula I

R¹ is: (a) C₁-C₅-alkyl, which is optionally mono-, di- or trisubstituted by one or more substituents selected from the group consisting of hydroxy, C₁-C₄-alkoxy, CF₃, phenoxy, COOH, —CO(C₁-C₄-alkoxy), —CONH₂, —CO—NH(C₁-C₄-alkyl), —CO—N(C₁-C₄-alkyl)₂ and C₁-C₄-alkoxy-phenoxy, (b) C₃-C₈-cycloalkyl, which is optionally linked via a C₁-C₄-akylene bridge and which is optionally mono-, di- or trisubstituted by one or more substituents selected from the group consisting of hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄-alkoxycarbonyl and CF₃, or (c) phenyl-C₁-C₄-alkyl, which is optionally mono-, di- or trisubstituted by one or more substituents selected from the group consisting of hydroxy, C₁-C₄-alkoxy, carboxy, C₁-C₄-alkoxycarbonyl and CF₃, (d) a 5- or 6-membered, saturated or unsaturated heterocyclic group, which is linked directly or via a C₁-C₄-alkylene bridge, which contains one or two hetero atoms selected from the group consisting of oxygen, nitrogen and sulphur and which is optionally substituted by C₁-C₄-alkyl or benzyl; R² is —C(═NH)NH₂ or —CH₂—NH₂; R³ is phenyl, benzyl, benzothienyl, quinolyl, isoquinolyl or naphthyl, each of which is mono, di- or trisubstituted by one or more substituents selected from the group consisting of C₁-C₄-alkyl, C₁-C₄-alkoxy, halogen, CF₃, —C₁-C₄-alkyl-halogen, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, NO₂, hydroxy, —CF₃, —NHCO-C₁-C₄-alkyl, —COOH, —COO(C₁-C₄-alkyl), —CONH₂, —CONH(C₁-C₄-alkyl), —CON(C₁-C₄-alkyl)₂, —(CH₃)₂-phenyl (wherein the phenyl group may be substituted by one or more halogen atoms or hydroxy groups) and —CONH(C₁-C₄-acyl)-COO(C₁-C₄-alkyl); and R⁴ is: (a) C₁-C₆-alkyl, which is optionally mono- or disubstituted by one or two substituents selected from the group consisting of —NH₂, NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂, or (b) a 5-, 6- or 7-membered, saturated or unsaturated nitrogen-containing heterocyclic group, which is lined directly or via a C₁-C₄-alkylene bridge or via a C₁-C₄-alkylene-CO bridge, which optionally contains one or two additional hetero atoms selected from the group consisting of oxygen, nitrogen and sulphur and which is optionally substituted by C₁-C₄-alkyl, benzyl or pyridyl; (c) cyclopropyl, cyclopentyl or cyclohexyl, each of which is mono- or disubstituted by one or two substituents selected from the group consisting of —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂, or (d) phenyl, benzyl or phenylethyl, each of which are mono- or disubstituted at the phenyl ring by one or two substitutents selected from the group consisting of —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ or —NH—C(═NH)NH₂; or a tautomer or pharmacologically acceptable acid addition salt thereof.
 2. A compound of the formula I

R¹ is: (a) methyl, ethyl, propyl, butyl or pentyl, each of which is optionally mono-substituted by hydroxy, methoxy, ethoxy, propoxy, CF₃, phenoxy, COOH, CONH₂, CONHMe or methoxy-phenoxy, or (b) benzyl, phenylethyl or phenylpropyl, each of which is optionally mono- or disubstituted at the phenyl ring by one or two substituents selected from the group consisting of hydroxy, methoxy, ethoxy, carboxy, methoxycarbonyl, ethoxycarbonyl and CF₃, or (c) a 5- or 6-membered, saturated or unsaturated heterocyclic group, which is linked directly or via a C₁-C₄-alkylene bridge, which contains one or two hetero atoms selected from the group consisting of oxygen and nitrogen and is optionally substituted by methyl, ethyl, propyl or benzyl; R² is —C(═NH)NH₂ or —CH₂—NH₂; R³ is phenyl, benzyl or naphthyl, each of which is mono- or disubstituted by one or two groups selected from the group consisting of methyl, ethyl, propyl, butyl, methoxy, ethoxy, propoxy, butoxy, fluorine, chlorine, bromine, iodine, —CF₃, —NH₂, —NHmethyl, —NHethyl, —Nmethyl₂, —Nethyl₂, NO₂, —NHCO-methyl, —NHCO-ethyl, —COOH, —COOmethyl, —COOethyl, —CONH₂, —CONHmethyl, —CONHethyl, —CONmethyl₂, —CONethyl₂, —CONH—CH₂—COOH, —CONH—CH₂—COOmethyl, —CONH—CH₂—COOethyl, —CONH—CH₂CH₂—COOH, —CONH—CH₂CH₂—COOmethyl, —C(CH₃)₂-phenyl (wherein the phenyl group is optionally substituted by one or more halogen atoms or hydroxy groups) and —CONH—CH₂CH₂—COOethyl; and R⁴ is: (a) ethyl, propyl, butyl, pentyl or hexyl, each of which is mono or disubstituted by one or two substituents selected from the class consisting of —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂, or (b) a 5-, 6- or 7-membered, saturated or unsaturated nitrogen-containing heterocyclic group, which is linked directly or via a C₁-C₄-allkylene bridge, which optionally contains one or two other hetero atoms selected from the group consisting of oxygen and nitrogen and which is optionally substituted by methyl, ethyl, propyl or benzyl, or (c) cyclopentyl or cyclohexyl, each of which is optionally mono- or disubstituted by one or two substituents selected from the group consisting of —NH₂, —NHmethyl, —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(iso-propyl)₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂, or (d) benzyl or phenylethyl, which are mono- or disubstituted at the phenyl ring by one or two substituents select from the group consisting of —NH₂, —NHmethyl —N(methyl)₂, —NHethyl, —N(ethyl)₂, —NH(n-propyl), —N(n-propyl)₂, —NH(iso-propyl), —N(so-propyl)₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂, or a tautomer or pharmacologically acceptable acid addition salt thereof.
 3. A compound of the formula I, in accordance with claim 2, wherein: R¹ is methyl, ethyl, propyl, butyl or pentyl; R² is —C(═NH)NH₂ or —CH₂—NH₂; R³ is phenyl or naphthyl, each of which is substituted by one or two substituents selected from the group consisting of methyl, ethyl, tert.-butyl, methoxy, ethoxy, fluorine, chlorine, bromine, CF₃, —NH₂, —NHmethyl, —NHethyl, —Nmethyl₂, —Nethyl₂, NO₂, —NHCO-methyl, —NHCO-ethyl, —COOH, —COOmethyl, —COOethyl, —CONH₂, —CONHmethyl, —CONHethyl, —CONmethyl₂, —CONethyl₂, —CONH₂—COOH, —CONH—CH₂—COOmethyl, —C(CH₃)₂-phenyl (wherein the phenyl group is optionally substituted by one or more halogen atoms or hydroxy groups) and —CONH—CH₂—COOethyl; and R⁴ is: (a) ethyl or propyl, each of which is mono-substituted by —NH₂, —N(methyl)₂, —N(ethyl)₂, —N(n-propyl)₂ or —C(═NH)NH₂, or (b) a 5-, 6- or 7-membered, saturated or unsaturated nitrogen-containing heterocyclic group, which is linked directly or via a methylene or ethylene bridge, which optionally contains an oxygen as a further heteroatom and which is optionally substituted by methyl, ethyl, propyl or benzyl, or (c) cyclopentyl or cyclohexyl, each of which is mono-substituted by —NH₂, —N(methyl)₂, —N(ethyl)₂, —N(n-propyl)₂ or —C(═NH)NH₂, or (d) benzyl, which is mono-substituted at the phenyl ring by —NH₂, —N(methyl)₂, —N(ethyl)₂, —N(n-propyl)₂ or —C(═NH)NH₂, or a tautomer or pharmacologically acceptable acid addition salt thereof.
 4. A compound of the formula I, in accordance with claim 2, wherein: R¹ is methyl, ethyl, propyl, butyl or pentyl; R² is —C(═NH)NH₂ or —CH₂—NH₂; R³ is: (a) phenyl which is substituted by one or two substituents selected from the group consisting of methyl, ethyl, tert-butyl, methoxy, ethoxy, fluorine, chlorine, bromine, CF₃, —NH₂, —NHmethyl, —NHethyl, —Nmethyl₂, —Nethyl₂, NO₂, —NHCO-methyl, —NHCO-ethyl, —COOH, —COOmethyl, —COOethyl, —CONH₂, —CONHmethyl, —CONHethyl, —CONmethy₂, —CONethyl₂, —CONH—CH₂—COOH, —CONH—CH₂—COOmethyl, —C(CH₃)₂-phenyl, (wherein the phenyl group is optionally substituted by one or more halogen atoms or hydroxy groups), and —CONH—CH₂—COOethyl, or (b) naphthyl which is substituted by —Nmethyl₂ or chlorine; and R⁴ is dimethylaminoethyl, diethylaminoetyl, dimethylaminopropyl or diethylaminopropyl, or a tautomer or pharmacologically acceptable acid addition salt thereof.
 5. A compound of the formula I, in accordance with claim 2, wherein: R¹ is methyl, ethyl or propyl; R² is —C(═NH)NH₂ or —CH₂—NH₂; R³ is: (a) phenyl which is substituted by one or two substituents selected from the group consisting of methyl, ethyl, tert-butyl, methoxy, ethoxy, fluorine, chlorine, bromine, CF₃, —NH₂, —NHmethyl, —NHetyl, —Nmethyl₂, —Nethyl₂, NO₂, —NHCO-methyl, —NHCOethyl, —COOH, —COOmethyl, —COOethyl, —CONH₂, —CONHmethyl, —CONHethyl, —CONmethyl₂, —CONethyl₂, —CONH—CH₂—COOH, —CONH—CH₂—COOmethyl, —C(CH₃)₂-phenyl, (wherein the phenyl group is optionally substituted by one or more halogen atoms or hydroxy groups), and —CONH—CH₂—COOethyl, or (b) naphthyl which is substituted by —Nmethyl₂ or chlorine; and R⁴ is dimethylaminoethyl or diethylaminoethyl, or a tautomer or pharmacologically acceptable acid addition salt thereof.
 6. A compound of the formula I, in accordance with claim 4, wherein: R¹ is methyl; R² is —C(═NH)NH₂ or —CH₂—NH₂; R³ is: (a) phenyl which is substituted by one or two substituents selected from the group consisting of methyl, tert-butyl, methoxy, chlorine, bromine, CF₃, —NH₂, NO₂, —NHCO-methyl, —COOethyl, —CONH—CH₂—COOH, —C(CH₃)₂-phenyl (wherein the phenyl group is optionally substituted by one or more halogen atoms or hydroxy groups), and —CONH—CH₂—COOethyl, or (b) naphthyl which is substituted by —Nmethyl₂ or chlorine; and R⁴ denotes diethylaminoethyl, or a tautomer or pharmacologically acceptable acid addition salt thereof.
 7. A compound of the formula II

wherein: R¹ is: (a) C₁-C₆-alkyl, C₂-C₆-alkenyl or C₂-C₆-alkynyl, each of which is optionally mono-, di- or trisubstituted by substituents selected from the group consisting of hydroxy, C₁-C₄-alkoxy, CF₃, phenoxy, COOH, halogen, —CO(C₁-C₄-alkoxy), —CONH₂, —CO—NH(C₁-C₄-alkyl), —CO—N(C₁-C₄-alkyl)₂, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂ and C₁-C₄-alkoxy-phenoxy, or (b) C₃-C₈-cycloalkyl which is optionally linked via a C₁-C₄-alkylene bridge, which isoptionally mono-, di- or trisubstituted by substituents selected from the group consisting of hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄-alkoxycarbonyl and CF₃, or (c) phenyl-C₁-C₄-alkyl, which is optionally mono-, di- or trisubstituted by substituents selected from the group consisting of hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄ alkoxycarbonyl and CF₃, or (d) a 5- or 6-membered, saturated or unsaturated heterocyclic group which is linked directly or via a C₁-C₄-alkylene bridge, which contains one or two hetero atoms selected from the group consisting of oxygen, nitrogen and sulphur and which is optionally substituted by C₁-C₄-alkyl or benzyl; R³ is: (a) phenyl, benzyl, naphthyl, quinolyl, isoquinolyl, furan, benzofuran, thiophene or benzothiophene, each of which is mono-, di- or trisubstituted by one or more substituents selected from the group consisting of C₁-C₄-alkyl, C₁-C₄-alkoxy, halogen, —C₁-C₄-alkyl-halogen, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, NO₂, hydroxy, —CF₃, —NHCO—C₁-C₄-alkyl, —COOH, —COO(C₁-C₄-alkyl), —CONH₂, —CONH(C₁-C₄-alkyl), —CON(C₁-C₄-alkyl)₂, —CONH(C₁-C₄-alkyl)—COO(C₁-C₄-alkyl) and phenyl-C₁-C₆-alkyl (which is optionally substituted by a substituent selected from the group consisting of C₁-C₆-alkoxy, hydroxy, halogen, CF₃ and C₁-C₆-alkyl, or (b) C₁-C₄-alkyl which is substituted by a substituent selected from the group consisting of —C(═NOH)NH₂, —C(═NCOO—C₁-C₁₂-alkyl)NH₂ and —C(═NCOO—C₁-C₈-alkyl-phenyl)NH₂; and R⁴ is: (a) C₁-C₆-alkyl, which is optionally mono- or disubstituted by one or two substituents selected from the group consisting of —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂, or (b) a 5-, 6- or 7-membered, saturated or unsaturated heterocyclic group which is linked directly or via a C₁-C₄-alkylene bridge or via a C₁-C₄-alkylene-CO bridge, which contains one, two or three hetero atoms selected from the group consisting of oxygen, nitrogen and sulphur and which is optionally substituted by C₁-C₄-alkyl, benzyl or pyridyl; (c) C₃-C₈-cycloalkyl, which is optionally mono- or disubstituted by one or two substituents selected from the group consisting of —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂, or (d) phenyl, benzyl or phenylethyl, each of which is optionally mono- or disubstituted at the phenyl ring by one or two substituents selected from the group consisting of —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C₁-C₄-alkyl—NH₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂; and, R⁵ is hydroxy, —COO—C₁-C₁₂-alkyl, —CO-phenyl, —CO-pyridyl or —COO—C₁-C₈-alkyl-phenyl, whilst if R⁵ includes a phenyl ring it is optionally substituted by C₁-C₄-alkyl, C₁-C₄-alkoxy, OH, halogen or CF₃; or a tautomer or pharmaceutically acceptable salt thereof.
 8. A compound of the formula II, in accordance with claim 7, wherein: R⁵ is hydroxy, —COO—C₁-C₆-alkyl, —CO-phenyl, —CO-pyridyl or —COO—C₁-C₆-alkyl-phenyl, whilst if R⁵ includes a phenyl ring it is optionally substituted by C₁-C₄-alkyl, C₁-C₄-alkoxy, OH, halogen or CF₃, or a tautomer or pharmaceutically acceptable salt thereof.
 9. A compound of the formula II, in accordance with claim 7, wherein: R⁵ is hydroxy, methoxycarbonyl, ethoxycarbonyl, propyloxycarbonyl, butyloxycarbonyl, benzoyl, benzyloxycarbonyl or nicotinoyl, or a tautomer or pharmaceutically acceptable salt thereof.
 10. A compound of the formula III

wherein: R¹ is: (a) C₁-C₆-alkyl, C₂-C₆-alkenyl or C₂-C₆-alkynyl, each of which is optionally mono-, di- or trisubstituted by one or more substituents selected from the group consisting of hydroxy, C₁-C₄-alkoxy, CF₃, phenoxy, COOH, halogen, —CO(C₁-C₄-alkoxy), —CONH₂, —CO—NH(C₁-C₄-alkyl), —CO—N(C₁-C₄-alkyl)₂, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂ and C₁-C₄-alkoxy-phenoxy, or (b) C₃-C₈-cycloalkyl which is optionally linked via a C₁-C₄-alkylene bridge and which is optionally mono-, di- or trisubstituted by one or more substituents selected from the group consisting of hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄-alkoxycarbonyl and CF₃, or (c) phenyl-C₁-C₄-alkyl, which is optionally mono-, di- or trisubstituted by one or more substituents selected from the group consisting of hydroxy, C₁-C₄-alkoxy, carboxy, halogen, C₁-C₄-alkoxycarbonyl and CF₃, or (d) a 5- or 6-membered, saturated or unsaturated heterocyclic group which is linked directly or via a C₁-C₄-alkylene bridge, which contains one or two hetero atoms selected from the group consisting of oxygen, nitrogen and sulphur and which is optionally substituted by C₁-C₄-alkyl or benzyl; R³ is phenyl, benzyl, naphthyl, quinolyl, isoquinolyl, furan, benzofuran, thiophene or benzothiophene, each of which is mono-, di- or trisubstituted by substituents selected from the group consisting of C₁-C₄-alkyl, C₁-C₄-alkoxy, halogen, —C₁-C₄-alkyl-halogen, —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, NO₂, hydroxy, —CF₃, —NHCO—C₁-C₄-alkyl, —COOH, —COO(C₁-C₄-alkyl), —CONH₂, —CONH(C₁-C₄-alkyl), —CON(C₁-C₄-alkyl)₂, —CONH(C₁-C₄-alkyl)-COO(C₁-C₄-alkyl) and phenyl-C₁-C₆-alkyl (which is optionally substituted by a substituent selected from the group consisting of C₁-C₆-alkoxy, hydroxy, halogen, CF₃ and C₁-C₆-alkyl); and, R⁴ is: (a) C₁-C₆-alkyl, which is optionally mono- or disubstituted by one or two substituents selected from the group consisting of —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂, or (b) a 5-, 6- or 7-membered, saturated or unsaturated heterocyclic group which is linked directly or via a C₁-C₄-alkylene bridge or via a C₁-C₄-alkylene-CO bridge, which contains one, two or three hetero atoms selected from the group consisting of oxygen, nitrogen and sulphur and which is optionally substituted by C₁-C₄-alkyl, benzyl or pyridyl; (c) C₃-C₈-cycloalkyl, which is optionally mono- or disubstituted by one or two substituents selected from the group consisting of —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂, or (d) phenyl, benzyl or phenylethyl, each of which is optionally mono- or disubstituted at the phenyl ring by one or two substituents selected from the group consisting of —NH₂, —NH(C₁-C₄-alkyl), —N(C₁-C₄-alkyl)₂, —C₁-C₄-alkyl-NH₂, —C(═NH)NH₂ and —NH—C(═NH)NH₂.
 11. A method for treating an inflammatory or allergic disease which comprises adminstering to a host in need of such treatment a therapeutic amount of a compound of the formula I, in accordance with claim 1, 2, 3, 4, 5 or 6 or a compound of the formula II, in accordance with claim 7, 8 or
 9. 12. A pharmaceutical composition comprising a compound of the formula I, in accordance with claim 1, 2, 3, 4, 5 or 6 or a compound of the formula II, in accordance with claim 7, 8 or 9, and a pharmaceutically acceptable carrier. 